Years ago there was a magazine test. That was inconclusive. with the calcium battery expected to last a bit longer, but the equivalent std battery had a little more capacity.
I have been using eurocarparts, but those hankook batteries may well be good value. And despite using a bigger battery in my spitfire, it is probably too big and doesn't cycle enough.
Not much help I am afraid.
I'm interested in this theory that too large a battery "doesn't cycle enough" and that this is somehow detrimental to the battery.
Quite early in the Carledo's life, I replaced the original, not very old, 038 battery with a boot mounted 075. The main reason for this was that the 038 seemed unable to crank the Vauxhall engine for any length of time, even when fully charged, half a dozen turns of the engine and cranking speed was noticeably slowing. there isn't and never has been a charging problem as the car is fitted with the Carltons 80 amp alternator and, besides startup, the car's demands on the battery are very small, I don't even have a HRW! I tried a different starter, on the basis that the one fitted might be drawing excessive current, to no avail. I also beefed up the earth leads, which helped only slightly and more in terms of initial cranking speed than duration of cranking available.
So I bit the bullet and did the conversion to a larger, boot mounted battery and the problem went away. Furthermore, the 075, which is a Varta, but wasn't new when I fitted it, is still there 5 years later and has never once failed to start the engine, despite frosts snow, 6 month layups before it was VED free and maintainance of the fuel system which requires considerable cranking to get fuel up to the rail again.
So my question is, is this a real thing or just a theory? I realize one mans experience on one car is not a statistical universe, but my own experience would seem to contradict it!